Smpte/Midi Time Code Tutorial; What Is Smpte (Time Code) - M-Audio Portman 4x4 Manual

OUT4 - PORTMAN 4x4/S
Control - PORTMAN 4x4/S
Inputs 1 through 4 correspond to the physical MIDI In connectors
1 through 4, and the SMPTE/Status corresponds to the 1/4"
SMPTE Input connector. Outputs 1 through 4 correspond to the
physical MIDI Out connectors 1 through 4, and the SMPTE
Control corresponds to the SMPTE processor command port.
Although the SMPTE/Status driver transfers time code data into
the program, the SMPTE Control driver does not actually transfer
SMPTE data out of the program. Instead, it is used by some appli-
cations to configure and control (Start Writing, Stop Writing, User
Bits, SMPTE format, Patchbay User Programs, etc.) the processor
that resides in the PORTMAN 4x4/S.
In order to route data between the application and specific ports
on the PORTMAN 4x4/S, select (from within your application)
the appropriate drivers of the above list. Many newer applications
(Cakewalk for Windows for example) will allow you to select and
access all the PORTMAN 4x4/S ports within the same session.
Other applications (for instance, as of this writing, Master Tracks
Pro 6.0 can only handle two MIDI ports) will limit the number of
input and output drivers you may select at one time.

SMPTE/MIDI Time Code Tutorial

This section of the manual gives a brief tutorial on various SMPTE
topics. This section is not by any stretch of the imagination an
exhaustive treatment of time code or syncing. Instead it is includ-
ed to make the PORTMAN 4x4/S SMPTE functions more under-
standable.

What is SMPTE (Time Code)?

SMPTE is a time coding standard which was developed in 1967
by the Society of Motion Picture and Television Engineers
(SMPTE) to be used in video editing. SMPTE attaches a unique
time stamp (80 bits of information) to each frame of video or film.
SMPTE readers may then extract that time information and syn-
chronize other devices to it. Because SMPTE may be encoded as
an actual audio signal, it also lends itself to audio applications
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